in English is:

geotropism

,

gravitropism

Mutations

Soft:(no mutation)*
Nasal:ngrafitropedd
Aspirate:(no mutation)

* This form is an exception to the mutation rules.

Use

y grafitropedd hwn
fy ngrafitropedd i
dy grafitropedd di
ei grafitropedd ef/o
ei grafitropedd hi
ein grafitropedd ni
eich grafitropedd chi
eu grafitropedd nhw/hwy
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